1997 Fiscal Year Final Research Report Summary
Quantification of non-coaxiality in constitutive relationship of clays and its application to limit equilibrium problem
| Project/Area Number |
08650571
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Kobe University (1997)
Kanazawa University (1996) |
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Principal Investigator |
IIZUKA Atsushi Kobe University, Associate Professor, 工学部, 助教授 (40184361)
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| Co-Investigator(Kenkyū-buntansha) |
OHTA Hideki Kanazawa University, Professor, 工学部, 教授 (80026187)
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| Project Period (FY) |
1996 – 1997
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| Keywords | shear deformation / shear band / strain localization / non-coaxiality / soil / water coupled problem / strength / F.E.simulation |
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| Research Abstract |
Recently, localized deformation in geo-materials has attracted many researchers with expecting rational explanation of phenomena such as progressive failure and size effect of footing on bearing capacity. The mathematical formulation of initial-boundary value problem for saturated soil mass is presented and the finite element technique is applied to solve it under appropriate initial and boundary conditions. The elastoplastic Cam-clay model is employed for the soil skeleton. In this study the theoretical framework for the soil/water coupled problem is extended to the finite deformation field where bifurcation of solutions in an initial boundary value problem may occur. The discretization for governing equations is proposed. After examining the numerical stability of the finite element scheme, the triaxial compression shear test of a clay specimen is simulated under the plane strain condition. It is revealed that the shear band observed as the strain localization in clay specimen always develops with dilation, which can be called the localization of dilatancy. Moreover is examined the applicability of such non-linear soil/water coupled formulation in the engineering practice in this study.
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[Publications] Ohta, H., Hirata, M., Iizuka, A., Yamakami, T., Yokota, Y.and Ohmori, K.: "Application of dilatancy models to soils reinforced by geosynthetics" Proc.of 6^<th> International Conference on Geosynthetics. (in print). (1998)
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